fs/ceph/inode.c

   1 #include <linux/ceph/ceph_debug.h>
   2
   3 #include <linux/module.h>
   4 #include <linux/fs.h>
   5 #include <linux/slab.h>
   6 #include <linux/string.h>
   7 #include <linux/uaccess.h>
   8 #include <linux/kernel.h>
   9 #include <linux/writeback.h>
  10 #include <linux/vmalloc.h>
  11 #include <linux/posix_acl.h>
  12 #include <linux/random.h>
  13
  14 #include "super.h"
  15 #include "mds_client.h"
  16 #include "cache.h"
  17 #include <linux/ceph/decode.h>
  18
  19 /*
  20  * Ceph inode operations
  21  *
  22  * Implement basic inode helpers (get, alloc) and inode ops (getattr,
  23  * setattr, etc.), xattr helpers, and helpers for assimilating
  24  * metadata returned by the MDS into our cache.
  25  *
  26  * Also define helpers for doing asynchronous writeback, invalidation,
  27  * and truncation for the benefit of those who can't afford to block
  28  * (typically because they are in the message handler path).
  29  */
  30
  31 static const struct inode_operations ceph_symlink_iops;
  32
  33 static void ceph_invalidate_work(struct work_struct *work);
  34 static void ceph_writeback_work(struct work_struct *work);
  35 static void ceph_vmtruncate_work(struct work_struct *work);
  36
  37 /*
  38  * find or create an inode, given the ceph ino number
  39  */
  40 static int ceph_set_ino_cb(struct inode *inode, void *data)
  41 {
  42         ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
  43         inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
  44         return 0;
  45 }
  46
  47 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
  48 {
  49         struct inode *inode;
  50         ino_t t = ceph_vino_to_ino(vino);
  51
  52         inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
  53         if (inode == NULL)
  54                 return ERR_PTR(-ENOMEM);
  55         if (inode->i_state & I_NEW) {
  56                 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
  57                      inode, ceph_vinop(inode), (u64)inode->i_ino);
  58                 unlock_new_inode(inode);
  59         }
  60
  61         dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
  62              vino.snap, inode);
  63         return inode;
  64 }
  65
  66 /*
  67  * get/constuct snapdir inode for a given directory
  68  */
  69 struct inode *ceph_get_snapdir(struct inode *parent)
  70 {
  71         struct ceph_vino vino = {
  72                 .ino = ceph_ino(parent),
  73                 .snap = CEPH_SNAPDIR,
  74         };
  75         struct inode *inode = ceph_get_inode(parent->i_sb, vino);
  76         struct ceph_inode_info *ci = ceph_inode(inode);
  77
  78         BUG_ON(!S_ISDIR(parent->i_mode));
  79         if (IS_ERR(inode))
  80                 return inode;
  81         inode->i_mode = parent->i_mode;
  82         inode->i_uid = parent->i_uid;
  83         inode->i_gid = parent->i_gid;
  84         inode->i_op = &ceph_snapdir_iops;
  85         inode->i_fop = &ceph_snapdir_fops;
  86         ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
  87         ci->i_rbytes = 0;
  88         return inode;
  89 }
  90
  91 const struct inode_operations ceph_file_iops = {
  92         .permission = ceph_permission,
  93         .setattr = ceph_setattr,
  94         .getattr = ceph_getattr,
  95         .setxattr = ceph_setxattr,
  96         .getxattr = ceph_getxattr,
  97         .listxattr = ceph_listxattr,
  98         .removexattr = ceph_removexattr,
  99         .get_acl = ceph_get_acl,
 100         .set_acl = ceph_set_acl,
 101 };
 102
 103
 104 /*
 105  * We use a 'frag tree' to keep track of the MDS's directory fragments
 106  * for a given inode (usually there is just a single fragment).  We
 107  * need to know when a child frag is delegated to a new MDS, or when
 108  * it is flagged as replicated, so we can direct our requests
 109  * accordingly.
 110  */
 111
 112 /*
 113  * find/create a frag in the tree
 114  */
 115 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
 116                                                     u32 f)
 117 {
 118         struct rb_node **p;
 119         struct rb_node *parent = NULL;
 120         struct ceph_inode_frag *frag;
 121         int c;
 122
 123         p = &ci->i_fragtree.rb_node;
 124         while (*p) {
 125                 parent = *p;
 126                 frag = rb_entry(parent, struct ceph_inode_frag, node);
 127                 c = ceph_frag_compare(f, frag->frag);
 128                 if (c < 0)
 129                         p = &(*p)->rb_left;
 130                 else if (c > 0)
 131                         p = &(*p)->rb_right;
 132                 else
 133                         return frag;
 134         }
 135
 136         frag = kmalloc(sizeof(*frag), GFP_NOFS);
 137         if (!frag) {
 138                 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
 139                        "frag %x\n", &ci->vfs_inode,
 140                        ceph_vinop(&ci->vfs_inode), f);
 141                 return ERR_PTR(-ENOMEM);
 142         }
 143         frag->frag = f;
 144         frag->split_by = 0;
 145         frag->mds = -1;
 146         frag->ndist = 0;
 147
 148         rb_link_node(&frag->node, parent, p);
 149         rb_insert_color(&frag->node, &ci->i_fragtree);
 150
 151         dout("get_or_create_frag added %llx.%llx frag %x\n",
 152              ceph_vinop(&ci->vfs_inode), f);
 153         return frag;
 154 }
 155
 156 /*
 157  * find a specific frag @f
 158  */
 159 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
 160 {
 161         struct rb_node *n = ci->i_fragtree.rb_node;
 162
 163         while (n) {
 164                 struct ceph_inode_frag *frag =
 165                         rb_entry(n, struct ceph_inode_frag, node);
 166                 int c = ceph_frag_compare(f, frag->frag);
 167                 if (c < 0)
 168                         n = n->rb_left;
 169                 else if (c > 0)
 170                         n = n->rb_right;
 171                 else
 172                         return frag;
 173         }
 174         return NULL;
 175 }
 176
 177 /*
 178  * Choose frag containing the given value @v.  If @pfrag is
 179  * specified, copy the frag delegation info to the caller if
 180  * it is present.
 181  */
 182 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 183                               struct ceph_inode_frag *pfrag, int *found)
 184 {
 185         u32 t = ceph_frag_make(0, 0);
 186         struct ceph_inode_frag *frag;
 187         unsigned nway, i;
 188         u32 n;
 189
 190         if (found)
 191                 *found = 0;
 192
 193         while (1) {
 194                 WARN_ON(!ceph_frag_contains_value(t, v));
 195                 frag = __ceph_find_frag(ci, t);
 196                 if (!frag)
 197                         break; /* t is a leaf */
 198                 if (frag->split_by == 0) {
 199                         if (pfrag)
 200                                 memcpy(pfrag, frag, sizeof(*pfrag));
 201                         if (found)
 202                                 *found = 1;
 203                         break;
 204                 }
 205
 206                 /* choose child */
 207                 nway = 1 << frag->split_by;
 208                 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
 209                      frag->split_by, nway);
 210                 for (i = 0; i < nway; i++) {
 211                         n = ceph_frag_make_child(t, frag->split_by, i);
 212                         if (ceph_frag_contains_value(n, v)) {
 213                                 t = n;
 214                                 break;
 215                         }
 216                 }
 217                 BUG_ON(i == nway);
 218         }
 219         dout("choose_frag(%x) = %x\n", v, t);
 220
 221         return t;
 222 }
 223
 224 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
 225                      struct ceph_inode_frag *pfrag, int *found)
 226 {
 227         u32 ret;
 228         mutex_lock(&ci->i_fragtree_mutex);
 229         ret = __ceph_choose_frag(ci, v, pfrag, found);
 230         mutex_unlock(&ci->i_fragtree_mutex);
 231         return ret;
 232 }
 233
 234 /*
 235  * Process dirfrag (delegation) info from the mds.  Include leaf
 236  * fragment in tree ONLY if ndist > 0.  Otherwise, only
 237  * branches/splits are included in i_fragtree)
 238  */
 239 static int ceph_fill_dirfrag(struct inode *inode,
 240                              struct ceph_mds_reply_dirfrag *dirinfo)
 241 {
 242         struct ceph_inode_info *ci = ceph_inode(inode);
 243         struct ceph_inode_frag *frag;
 244         u32 id = le32_to_cpu(dirinfo->frag);
 245         int mds = le32_to_cpu(dirinfo->auth);
 246         int ndist = le32_to_cpu(dirinfo->ndist);
 247         int diri_auth = -1;
 248         int i;
 249         int err = 0;
 250
 251         spin_lock(&ci->i_ceph_lock);
 252         if (ci->i_auth_cap)
 253                 diri_auth = ci->i_auth_cap->mds;
 254         spin_unlock(&ci->i_ceph_lock);
 255
 256         mutex_lock(&ci->i_fragtree_mutex);
 257         if (ndist == 0 && mds == diri_auth) {
 258                 /* no delegation info needed. */
 259                 frag = __ceph_find_frag(ci, id);
 260                 if (!frag)
 261                         goto out;
 262                 if (frag->split_by == 0) {
 263                         /* tree leaf, remove */
 264                         dout("fill_dirfrag removed %llx.%llx frag %x"
 265                              " (no ref)\n", ceph_vinop(inode), id);
 266                         rb_erase(&frag->node, &ci->i_fragtree);
 267                         kfree(frag);
 268                 } else {
 269                         /* tree branch, keep and clear */
 270                         dout("fill_dirfrag cleared %llx.%llx frag %x"
 271                              " referral\n", ceph_vinop(inode), id);
 272                         frag->mds = -1;
 273                         frag->ndist = 0;
 274                 }
 275                 goto out;
 276         }
 277
 278
 279         /* find/add this frag to store mds delegation info */
 280         frag = __get_or_create_frag(ci, id);
 281         if (IS_ERR(frag)) {
 282                 /* this is not the end of the world; we can continue
 283                    with bad/inaccurate delegation info */
 284                 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
 285                        ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
 286                 err = -ENOMEM;
 287                 goto out;
 288         }
 289
 290         frag->mds = mds;
 291         frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
 292         for (i = 0; i < frag->ndist; i++)
 293                 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
 294         dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
 295              ceph_vinop(inode), frag->frag, frag->ndist);
 296
 297 out:
 298         mutex_unlock(&ci->i_fragtree_mutex);
 299         return err;
 300 }
 301
 302 static int ceph_fill_fragtree(struct inode *inode,
 303                               struct ceph_frag_tree_head *fragtree,
 304                               struct ceph_mds_reply_dirfrag *dirinfo)
 305 {
 306         struct ceph_inode_info *ci = ceph_inode(inode);
 307         struct ceph_inode_frag *frag;
 308         struct rb_node *rb_node;
 309         int i;
 310         u32 id, nsplits;
 311         bool update = false;
 312
 313         mutex_lock(&ci->i_fragtree_mutex);
 314         nsplits = le32_to_cpu(fragtree->nsplits);
 315         if (nsplits) {
 316                 i = prandom_u32() % nsplits;
 317                 id = le32_to_cpu(fragtree->splits[i].frag);
 318                 if (!__ceph_find_frag(ci, id))
 319                         update = true;
 320         } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
 321                 rb_node = rb_first(&ci->i_fragtree);
 322                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 323                 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
 324                         update = true;
 325         }
 326         if (!update && dirinfo) {
 327                 id = le32_to_cpu(dirinfo->frag);
 328                 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
 329                         update = true;
 330         }
 331         if (!update)
 332                 goto out_unlock;
 333
 334         dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
 335         rb_node = rb_first(&ci->i_fragtree);
 336         for (i = 0; i < nsplits; i++) {
 337                 id = le32_to_cpu(fragtree->splits[i].frag);
 338                 frag = NULL;
 339                 while (rb_node) {
 340                         frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 341                         if (ceph_frag_compare(frag->frag, id) >= 0) {
 342                                 if (frag->frag != id)
 343                                         frag = NULL;
 344                                 else
 345                                         rb_node = rb_next(rb_node);
 346                                 break;
 347                         }
 348                         rb_node = rb_next(rb_node);
 349                         rb_erase(&frag->node, &ci->i_fragtree);
 350                         kfree(frag);
 351                         frag = NULL;
 352                 }
 353                 if (!frag) {
 354                         frag = __get_or_create_frag(ci, id);
 355                         if (IS_ERR(frag))
 356                                 continue;
 357                 }
 358                 frag->split_by = le32_to_cpu(fragtree->splits[i].by);
 359                 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
 360         }
 361         while (rb_node) {
 362                 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
 363                 rb_node = rb_next(rb_node);
 364                 rb_erase(&frag->node, &ci->i_fragtree);
 365                 kfree(frag);
 366         }
 367 out_unlock:
 368         mutex_unlock(&ci->i_fragtree_mutex);
 369         return 0;
 370 }
 371
 372 /*
 373  * initialize a newly allocated inode.
 374  */
 375 struct inode *ceph_alloc_inode(struct super_block *sb)
 376 {
 377         struct ceph_inode_info *ci;
 378         int i;
 379
 380         ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
 381         if (!ci)
 382                 return NULL;
 383
 384         dout("alloc_inode %p\n", &ci->vfs_inode);
 385
 386         spin_lock_init(&ci->i_ceph_lock);
 387
 388         ci->i_version = 0;
 389         ci->i_inline_version = 0;
 390         ci->i_time_warp_seq = 0;
 391         ci->i_ceph_flags = 0;
 392         atomic64_set(&ci->i_ordered_count, 1);
 393         atomic64_set(&ci->i_release_count, 1);
 394         atomic64_set(&ci->i_complete_seq[0], 0);
 395         atomic64_set(&ci->i_complete_seq[1], 0);
 396         ci->i_symlink = NULL;
 397
 398         memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 399         ci->i_pool_ns_len = 0;
 400
 401         ci->i_fragtree = RB_ROOT;
 402         mutex_init(&ci->i_fragtree_mutex);
 403
 404         ci->i_xattrs.blob = NULL;
 405         ci->i_xattrs.prealloc_blob = NULL;
 406         ci->i_xattrs.dirty = false;
 407         ci->i_xattrs.index = RB_ROOT;
 408         ci->i_xattrs.count = 0;
 409         ci->i_xattrs.names_size = 0;
 410         ci->i_xattrs.vals_size = 0;
 411         ci->i_xattrs.version = 0;
 412         ci->i_xattrs.index_version = 0;
 413
 414         ci->i_caps = RB_ROOT;
 415         ci->i_auth_cap = NULL;
 416         ci->i_dirty_caps = 0;
 417         ci->i_flushing_caps = 0;
 418         INIT_LIST_HEAD(&ci->i_dirty_item);
 419         INIT_LIST_HEAD(&ci->i_flushing_item);
 420         ci->i_prealloc_cap_flush = NULL;
 421         ci->i_cap_flush_tree = RB_ROOT;
 422         init_waitqueue_head(&ci->i_cap_wq);
 423         ci->i_hold_caps_min = 0;
 424         ci->i_hold_caps_max = 0;
 425         INIT_LIST_HEAD(&ci->i_cap_delay_list);
 426         INIT_LIST_HEAD(&ci->i_cap_snaps);
 427         ci->i_head_snapc = NULL;
 428         ci->i_snap_caps = 0;
 429
 430         for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
 431                 ci->i_nr_by_mode[i] = 0;
 432
 433         mutex_init(&ci->i_truncate_mutex);
 434         ci->i_truncate_seq = 0;
 435         ci->i_truncate_size = 0;
 436         ci->i_truncate_pending = 0;
 437
 438         ci->i_max_size = 0;
 439         ci->i_reported_size = 0;
 440         ci->i_wanted_max_size = 0;
 441         ci->i_requested_max_size = 0;
 442
 443         ci->i_pin_ref = 0;
 444         ci->i_rd_ref = 0;
 445         ci->i_rdcache_ref = 0;
 446         ci->i_wr_ref = 0;
 447         ci->i_wb_ref = 0;
 448         ci->i_wrbuffer_ref = 0;
 449         ci->i_wrbuffer_ref_head = 0;
 450         ci->i_shared_gen = 0;
 451         ci->i_rdcache_gen = 0;
 452         ci->i_rdcache_revoking = 0;
 453
 454         INIT_LIST_HEAD(&ci->i_unsafe_writes);
 455         INIT_LIST_HEAD(&ci->i_unsafe_dirops);
 456         INIT_LIST_HEAD(&ci->i_unsafe_iops);
 457         spin_lock_init(&ci->i_unsafe_lock);
 458
 459         ci->i_snap_realm = NULL;
 460         INIT_LIST_HEAD(&ci->i_snap_realm_item);
 461         INIT_LIST_HEAD(&ci->i_snap_flush_item);
 462
 463         INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
 464         INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
 465
 466         INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
 467
 468         ceph_fscache_inode_init(ci);
 469
 470         return &ci->vfs_inode;
 471 }
 472
 473 static void ceph_i_callback(struct rcu_head *head)
 474 {
 475         struct inode *inode = container_of(head, struct inode, i_rcu);
 476         struct ceph_inode_info *ci = ceph_inode(inode);
 477
 478         kmem_cache_free(ceph_inode_cachep, ci);
 479 }
 480
 481 void ceph_destroy_inode(struct inode *inode)
 482 {
 483         struct ceph_inode_info *ci = ceph_inode(inode);
 484         struct ceph_inode_frag *frag;
 485         struct rb_node *n;
 486
 487         dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
 488
 489         ceph_fscache_unregister_inode_cookie(ci);
 490
 491         ceph_queue_caps_release(inode);
 492
 493         /*
 494          * we may still have a snap_realm reference if there are stray
 495          * caps in i_snap_caps.
 496          */
 497         if (ci->i_snap_realm) {
 498                 struct ceph_mds_client *mdsc =
 499                         ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
 500                 struct ceph_snap_realm *realm = ci->i_snap_realm;
 501
 502                 dout(" dropping residual ref to snap realm %p\n", realm);
 503                 spin_lock(&realm->inodes_with_caps_lock);
 504                 list_del_init(&ci->i_snap_realm_item);
 505                 spin_unlock(&realm->inodes_with_caps_lock);
 506                 ceph_put_snap_realm(mdsc, realm);
 507         }
 508
 509         kfree(ci->i_symlink);
 510         while ((n = rb_first(&ci->i_fragtree)) != NULL) {
 511                 frag = rb_entry(n, struct ceph_inode_frag, node);
 512                 rb_erase(n, &ci->i_fragtree);
 513                 kfree(frag);
 514         }
 515
 516         __ceph_destroy_xattrs(ci);
 517         if (ci->i_xattrs.blob)
 518                 ceph_buffer_put(ci->i_xattrs.blob);
 519         if (ci->i_xattrs.prealloc_blob)
 520                 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 521
 522         call_rcu(&inode->i_rcu, ceph_i_callback);
 523 }
 524
 525 int ceph_drop_inode(struct inode *inode)
 526 {
 527         /*
 528          * Positve dentry and corresponding inode are always accompanied
 529          * in MDS reply. So no need to keep inode in the cache after
 530          * dropping all its aliases.
 531          */
 532         return 1;
 533 }
 534
 535 /*
 536  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 537  * careful because either the client or MDS may have more up to date
 538  * info, depending on which capabilities are held, and whether
 539  * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 540  * and size are monotonically increasing, except when utimes() or
 541  * truncate() increments the corresponding _seq values.)
 542  */
 543 int ceph_fill_file_size(struct inode *inode, int issued,
 544                         u32 truncate_seq, u64 truncate_size, u64 size)
 545 {
 546         struct ceph_inode_info *ci = ceph_inode(inode);
 547         int queue_trunc = 0;
 548
 549         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
 550             (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
 551                 dout("size %lld -> %llu\n", inode->i_size, size);
 552                 i_size_write(inode, size);
 553                 inode->i_blocks = (size + (1<<9) - 1) >> 9;
 554                 ci->i_reported_size = size;
 555                 if (truncate_seq != ci->i_truncate_seq) {
 556                         dout("truncate_seq %u -> %u\n",
 557                              ci->i_truncate_seq, truncate_seq);
 558                         ci->i_truncate_seq = truncate_seq;
 559
 560                         /* the MDS should have revoked these caps */
 561                         WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
 562                                                CEPH_CAP_FILE_RD |
 563                                                CEPH_CAP_FILE_WR |
 564                                                CEPH_CAP_FILE_LAZYIO));
 565                         /*
 566                          * If we hold relevant caps, or in the case where we're
 567                          * not the only client referencing this file and we
 568                          * don't hold those caps, then we need to check whether
 569                          * the file is either opened or mmaped
 570                          */
 571                         if ((issued & (CEPH_CAP_FILE_CACHE|
 572                                        CEPH_CAP_FILE_BUFFER)) ||
 573                             mapping_mapped(inode->i_mapping) ||
 574                             __ceph_caps_file_wanted(ci)) {
 575                                 ci->i_truncate_pending++;
 576                                 queue_trunc = 1;
 577                         }
 578                 }
 579         }
 580         if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
 581             ci->i_truncate_size != truncate_size) {
 582                 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
 583                      truncate_size);
 584                 ci->i_truncate_size = truncate_size;
 585         }
 586
 587         if (queue_trunc)
 588                 ceph_fscache_invalidate(inode);
 589
 590         return queue_trunc;
 591 }
 592
 593 void ceph_fill_file_time(struct inode *inode, int issued,
 594                          u64 time_warp_seq, struct timespec *ctime,
 595                          struct timespec *mtime, struct timespec *atime)
 596 {
 597         struct ceph_inode_info *ci = ceph_inode(inode);
 598         int warn = 0;
 599
 600         if (issued & (CEPH_CAP_FILE_EXCL|
 601                       CEPH_CAP_FILE_WR|
 602                       CEPH_CAP_FILE_BUFFER|
 603                       CEPH_CAP_AUTH_EXCL|
 604                       CEPH_CAP_XATTR_EXCL)) {
 605                 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
 606                         dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
 607                              inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
 608                              ctime->tv_sec, ctime->tv_nsec);
 609                         inode->i_ctime = *ctime;
 610                 }
 611                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
 612                         /* the MDS did a utimes() */
 613                         dout("mtime %ld.%09ld -> %ld.%09ld "
 614                              "tw %d -> %d\n",
 615                              inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
 616                              mtime->tv_sec, mtime->tv_nsec,
 617                              ci->i_time_warp_seq, (int)time_warp_seq);
 618
 619                         inode->i_mtime = *mtime;
 620                         inode->i_atime = *atime;
 621                         ci->i_time_warp_seq = time_warp_seq;
 622                 } else if (time_warp_seq == ci->i_time_warp_seq) {
 623                         /* nobody did utimes(); take the max */
 624                         if (timespec_compare(mtime, &inode->i_mtime) > 0) {
 625                                 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
 626                                      inode->i_mtime.tv_sec,
 627                                      inode->i_mtime.tv_nsec,
 628                                      mtime->tv_sec, mtime->tv_nsec);
 629                                 inode->i_mtime = *mtime;
 630                         }
 631                         if (timespec_compare(atime, &inode->i_atime) > 0) {
 632                                 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
 633                                      inode->i_atime.tv_sec,
 634                                      inode->i_atime.tv_nsec,
 635                                      atime->tv_sec, atime->tv_nsec);
 636                                 inode->i_atime = *atime;
 637                         }
 638                 } else if (issued & CEPH_CAP_FILE_EXCL) {
 639                         /* we did a utimes(); ignore mds values */
 640                 } else {
 641                         warn = 1;
 642                 }
 643         } else {
 644                 /* we have no write|excl caps; whatever the MDS says is true */
 645                 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
 646                         inode->i_ctime = *ctime;
 647                         inode->i_mtime = *mtime;
 648                         inode->i_atime = *atime;
 649                         ci->i_time_warp_seq = time_warp_seq;
 650                 } else {
 651                         warn = 1;
 652                 }
 653         }
 654         if (warn) /* time_warp_seq shouldn't go backwards */
 655                 dout("%p mds time_warp_seq %llu < %u\n",
 656                      inode, time_warp_seq, ci->i_time_warp_seq);
 657 }
 658
 659 /*
 660  * Populate an inode based on info from mds.  May be called on new or
 661  * existing inodes.
 662  */
 663 static int fill_inode(struct inode *inode, struct page *locked_page,
 664                       struct ceph_mds_reply_info_in *iinfo,
 665                       struct ceph_mds_reply_dirfrag *dirinfo,
 666                       struct ceph_mds_session *session,
 667                       unsigned long ttl_from, int cap_fmode,
 668                       struct ceph_cap_reservation *caps_reservation)
 669 {
 670         struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
 671         struct ceph_mds_reply_inode *info = iinfo->in;
 672         struct ceph_inode_info *ci = ceph_inode(inode);
 673         int issued = 0, implemented, new_issued;
 674         struct timespec mtime, atime, ctime;
 675         struct ceph_buffer *xattr_blob = NULL;
 676         struct ceph_cap *new_cap = NULL;
 677         int err = 0;
 678         bool wake = false;
 679         bool queue_trunc = false;
 680         bool new_version = false;
 681         bool fill_inline = false;
 682
 683         dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
 684              inode, ceph_vinop(inode), le64_to_cpu(info->version),
 685              ci->i_version);
 686
 687         /* prealloc new cap struct */
 688         if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
 689                 new_cap = ceph_get_cap(mdsc, caps_reservation);
 690
 691         /*
 692          * prealloc xattr data, if it looks like we'll need it.  only
 693          * if len > 4 (meaning there are actually xattrs; the first 4
 694          * bytes are the xattr count).
 695          */
 696         if (iinfo->xattr_len > 4) {
 697                 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
 698                 if (!xattr_blob)
 699                         pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
 700                                iinfo->xattr_len);
 701         }
 702
 703         spin_lock(&ci->i_ceph_lock);
 704
 705         /*
 706          * provided version will be odd if inode value is projected,
 707          * even if stable.  skip the update if we have newer stable
 708          * info (ours>=theirs, e.g. due to racing mds replies), unless
 709          * we are getting projected (unstable) info (in which case the
 710          * version is odd, and we want ours>theirs).
 711          *   us   them
 712          *   2    2     skip
 713          *   3    2     skip
 714          *   3    3     update
 715          */
 716         if (ci->i_version == 0 ||
 717             ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 718              le64_to_cpu(info->version) > (ci->i_version & ~1)))
 719                 new_version = true;
 720
 721         issued = __ceph_caps_issued(ci, &implemented);
 722         issued |= implemented | __ceph_caps_dirty(ci);
 723         new_issued = ~issued & le32_to_cpu(info->cap.caps);
 724
 725         /* update inode */
 726         ci->i_version = le64_to_cpu(info->version);
 727         inode->i_version++;
 728         inode->i_rdev = le32_to_cpu(info->rdev);
 729         inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
 730
 731         if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
 732             (issued & CEPH_CAP_AUTH_EXCL) == 0) {
 733                 inode->i_mode = le32_to_cpu(info->mode);
 734                 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
 735                 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
 736                 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
 737                      from_kuid(&init_user_ns, inode->i_uid),
 738                      from_kgid(&init_user_ns, inode->i_gid));
 739         }
 740
 741         if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
 742             (issued & CEPH_CAP_LINK_EXCL) == 0)
 743                 set_nlink(inode, le32_to_cpu(info->nlink));
 744
 745         if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
 746                 /* be careful with mtime, atime, size */
 747                 ceph_decode_timespec(&atime, &info->atime);
 748                 ceph_decode_timespec(&mtime, &info->mtime);
 749                 ceph_decode_timespec(&ctime, &info->ctime);
 750                 ceph_fill_file_time(inode, issued,
 751                                 le32_to_cpu(info->time_warp_seq),
 752                                 &ctime, &mtime, &atime);
 753         }
 754
 755         if (new_version ||
 756             (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 757                 if (ci->i_layout.fl_pg_pool != info->layout.fl_pg_pool)
 758                         ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 759                 ci->i_layout = info->layout;
 760                 ci->i_pool_ns_len = iinfo->pool_ns_len;
 761
 762                 queue_trunc = ceph_fill_file_size(inode, issued,
 763                                         le32_to_cpu(info->truncate_seq),
 764                                         le64_to_cpu(info->truncate_size),
 765                                         le64_to_cpu(info->size));
 766                 /* only update max_size on auth cap */
 767                 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
 768                     ci->i_max_size != le64_to_cpu(info->max_size)) {
 769                         dout("max_size %lld -> %llu\n", ci->i_max_size,
 770                                         le64_to_cpu(info->max_size));
 771                         ci->i_max_size = le64_to_cpu(info->max_size);
 772                 }
 773         }
 774
 775         /* xattrs */
 776         /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
 777         if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
 778             le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
 779                 if (ci->i_xattrs.blob)
 780                         ceph_buffer_put(ci->i_xattrs.blob);
 781                 ci->i_xattrs.blob = xattr_blob;
 782                 if (xattr_blob)
 783                         memcpy(ci->i_xattrs.blob->vec.iov_base,
 784                                iinfo->xattr_data, iinfo->xattr_len);
 785                 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
 786                 ceph_forget_all_cached_acls(inode);
 787                 xattr_blob = NULL;
 788         }
 789
 790         inode->i_mapping->a_ops = &ceph_aops;
 791
 792         switch (inode->i_mode & S_IFMT) {
 793         case S_IFIFO:
 794         case S_IFBLK:
 795         case S_IFCHR:
 796         case S_IFSOCK:
 797                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 798                 inode->i_op = &ceph_file_iops;
 799                 break;
 800         case S_IFREG:
 801                 inode->i_op = &ceph_file_iops;
 802                 inode->i_fop = &ceph_file_fops;
 803                 break;
 804         case S_IFLNK:
 805                 inode->i_op = &ceph_symlink_iops;
 806                 if (!ci->i_symlink) {
 807                         u32 symlen = iinfo->symlink_len;
 808                         char *sym;
 809
 810                         spin_unlock(&ci->i_ceph_lock);
 811
 812                         err = -EINVAL;
 813                         if (WARN_ON(symlen != i_size_read(inode)))
 814                                 goto out;
 815
 816                         err = -ENOMEM;
 817                         sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
 818                         if (!sym)
 819                                 goto out;
 820
 821                         spin_lock(&ci->i_ceph_lock);
 822                         if (!ci->i_symlink)
 823                                 ci->i_symlink = sym;
 824                         else
 825                                 kfree(sym); /* lost a race */
 826                 }
 827                 inode->i_link = ci->i_symlink;
 828                 break;
 829         case S_IFDIR:
 830                 inode->i_op = &ceph_dir_iops;
 831                 inode->i_fop = &ceph_dir_fops;
 832
 833                 ci->i_dir_layout = iinfo->dir_layout;
 834
 835                 ci->i_files = le64_to_cpu(info->files);
 836                 ci->i_subdirs = le64_to_cpu(info->subdirs);
 837                 ci->i_rbytes = le64_to_cpu(info->rbytes);
 838                 ci->i_rfiles = le64_to_cpu(info->rfiles);
 839                 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
 840                 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
 841                 break;
 842         default:
 843                 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
 844                        ceph_vinop(inode), inode->i_mode);
 845         }
 846
 847         /* were we issued a capability? */
 848         if (info->cap.caps) {
 849                 if (ceph_snap(inode) == CEPH_NOSNAP) {
 850                         unsigned caps = le32_to_cpu(info->cap.caps);
 851                         ceph_add_cap(inode, session,
 852                                      le64_to_cpu(info->cap.cap_id),
 853                                      cap_fmode, caps,
 854                                      le32_to_cpu(info->cap.wanted),
 855                                      le32_to_cpu(info->cap.seq),
 856                                      le32_to_cpu(info->cap.mseq),
 857                                      le64_to_cpu(info->cap.realm),
 858                                      info->cap.flags, &new_cap);
 859
 860                         /* set dir completion flag? */
 861                         if (S_ISDIR(inode->i_mode) &&
 862                             ci->i_files == 0 && ci->i_subdirs == 0 &&
 863                             (caps & CEPH_CAP_FILE_SHARED) &&
 864                             (issued & CEPH_CAP_FILE_EXCL) == 0 &&
 865                             !__ceph_dir_is_complete(ci)) {
 866                                 dout(" marking %p complete (empty)\n", inode);
 867                                 i_size_write(inode, 0);
 868                                 __ceph_dir_set_complete(ci,
 869                                         atomic64_read(&ci->i_release_count),
 870                                         atomic64_read(&ci->i_ordered_count));
 871                         }
 872
 873                         wake = true;
 874                 } else {
 875                         dout(" %p got snap_caps %s\n", inode,
 876                              ceph_cap_string(le32_to_cpu(info->cap.caps)));
 877                         ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
 878                         if (cap_fmode >= 0)
 879                                 __ceph_get_fmode(ci, cap_fmode);
 880                 }
 881         } else if (cap_fmode >= 0) {
 882                 pr_warn("mds issued no caps on %llx.%llx\n",
 883                            ceph_vinop(inode));
 884                 __ceph_get_fmode(ci, cap_fmode);
 885         }
 886
 887         if (iinfo->inline_version > 0 &&
 888             iinfo->inline_version >= ci->i_inline_version) {
 889                 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
 890                 ci->i_inline_version = iinfo->inline_version;
 891                 if (ci->i_inline_version != CEPH_INLINE_NONE &&
 892                     (locked_page ||
 893                      (le32_to_cpu(info->cap.caps) & cache_caps)))
 894                         fill_inline = true;
 895         }
 896
 897         spin_unlock(&ci->i_ceph_lock);
 898
 899         if (fill_inline)
 900                 ceph_fill_inline_data(inode, locked_page,
 901                                       iinfo->inline_data, iinfo->inline_len);
 902
 903         if (wake)
 904                 wake_up_all(&ci->i_cap_wq);
 905
 906         /* queue truncate if we saw i_size decrease */
 907         if (queue_trunc)
 908                 ceph_queue_vmtruncate(inode);
 909
 910         /* populate frag tree */
 911         if (S_ISDIR(inode->i_mode))
 912                 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
 913
 914         /* update delegation info? */
 915         if (dirinfo)
 916                 ceph_fill_dirfrag(inode, dirinfo);
 917
 918         err = 0;
 919 out:
 920         if (new_cap)
 921                 ceph_put_cap(mdsc, new_cap);
 922         if (xattr_blob)
 923                 ceph_buffer_put(xattr_blob);
 924         return err;
 925 }
 926
 927 /*
 928  * caller should hold session s_mutex.
 929  */
 930 static void update_dentry_lease(struct dentry *dentry,
 931                                 struct ceph_mds_reply_lease *lease,
 932                                 struct ceph_mds_session *session,
 933                                 unsigned long from_time)
 934 {
 935         struct ceph_dentry_info *di = ceph_dentry(dentry);
 936         long unsigned duration = le32_to_cpu(lease->duration_ms);
 937         long unsigned ttl = from_time + (duration * HZ) / 1000;
 938         long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
 939         struct inode *dir;
 940
 941         /* only track leases on regular dentries */
 942         if (dentry->d_op != &ceph_dentry_ops)
 943                 return;
 944
 945         spin_lock(&dentry->d_lock);
 946         dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
 947              dentry, duration, ttl);
 948
 949         /* make lease_rdcache_gen match directory */
 950         dir = d_inode(dentry->d_parent);
 951         di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
 952
 953         if (duration == 0)
 954                 goto out_unlock;
 955
 956         if (di->lease_gen == session->s_cap_gen &&
 957             time_before(ttl, dentry->d_time))
 958                 goto out_unlock;  /* we already have a newer lease. */
 959
 960         if (di->lease_session && di->lease_session != session)
 961                 goto out_unlock;
 962
 963         ceph_dentry_lru_touch(dentry);
 964
 965         if (!di->lease_session)
 966                 di->lease_session = ceph_get_mds_session(session);
 967         di->lease_gen = session->s_cap_gen;
 968         di->lease_seq = le32_to_cpu(lease->seq);
 969         di->lease_renew_after = half_ttl;
 970         di->lease_renew_from = 0;
 971         dentry->d_time = ttl;
 972 out_unlock:
 973         spin_unlock(&dentry->d_lock);
 974         return;
 975 }
 976
 977 /*
 978  * splice a dentry to an inode.
 979  * caller must hold directory i_mutex for this to be safe.
 980  *
 981  * we will only rehash the resulting dentry if @prehash is
 982  * true; @prehash will be set to false (for the benefit of
 983  * the caller) if we fail.
 984  */
 985 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
 986                                     bool *prehash)
 987 {
 988         struct dentry *realdn;
 989
 990         BUG_ON(d_inode(dn));
 991
 992         /* dn must be unhashed */
 993         if (!d_unhashed(dn))
 994                 d_drop(dn);
 995         realdn = d_splice_alias(in, dn);
 996         if (IS_ERR(realdn)) {
 997                 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 998                        PTR_ERR(realdn), dn, in, ceph_vinop(in));
 999                 if (prehash)
1000                         *prehash = false; /* don't rehash on error */
1001                 dn = realdn; /* note realdn contains the error */
1002                 goto out;
1003         } else if (realdn) {
1004                 dout("dn %p (%d) spliced with %p (%d) "
1005                      "inode %p ino %llx.%llx\n",
1006                      dn, d_count(dn),
1007                      realdn, d_count(realdn),
1008                      d_inode(realdn), ceph_vinop(d_inode(realdn)));
1009                 dput(dn);
1010                 dn = realdn;
1011         } else {
1012                 BUG_ON(!ceph_dentry(dn));
1013                 dout("dn %p attached to %p ino %llx.%llx\n",
1014                      dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1015         }
1016         if ((!prehash || *prehash) && d_unhashed(dn))
1017                 d_rehash(dn);
1018 out:
1019         return dn;
1020 }
1021
1022 /*
1023  * Incorporate results into the local cache.  This is either just
1024  * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1025  * after a lookup).
1026  *
1027  * A reply may contain
1028  *         a directory inode along with a dentry.
1029  *  and/or a target inode
1030  *
1031  * Called with snap_rwsem (read).
1032  */
1033 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
1034                     struct ceph_mds_session *session)
1035 {
1036         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1037         struct inode *in = NULL;
1038         struct ceph_vino vino;
1039         struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1040         int err = 0;
1041
1042         dout("fill_trace %p is_dentry %d is_target %d\n", req,
1043              rinfo->head->is_dentry, rinfo->head->is_target);
1044
1045 #if 0
1046         /*
1047          * Debugging hook:
1048          *
1049          * If we resend completed ops to a recovering mds, we get no
1050          * trace.  Since that is very rare, pretend this is the case
1051          * to ensure the 'no trace' handlers in the callers behave.
1052          *
1053          * Fill in inodes unconditionally to avoid breaking cap
1054          * invariants.
1055          */
1056         if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1057                 pr_info("fill_trace faking empty trace on %lld %s\n",
1058                         req->r_tid, ceph_mds_op_name(rinfo->head->op));
1059                 if (rinfo->head->is_dentry) {
1060                         rinfo->head->is_dentry = 0;
1061                         err = fill_inode(req->r_locked_dir,
1062                                          &rinfo->diri, rinfo->dirfrag,
1063                                          session, req->r_request_started, -1);
1064                 }
1065                 if (rinfo->head->is_target) {
1066                         rinfo->head->is_target = 0;
1067                         ininfo = rinfo->targeti.in;
1068                         vino.ino = le64_to_cpu(ininfo->ino);
1069                         vino.snap = le64_to_cpu(ininfo->snapid);
1070                         in = ceph_get_inode(sb, vino);
1071                         err = fill_inode(in, &rinfo->targeti, NULL,
1072                                          session, req->r_request_started,
1073                                          req->r_fmode);
1074                         iput(in);
1075                 }
1076         }
1077 #endif
1078
1079         if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1080                 dout("fill_trace reply is empty!\n");
1081                 if (rinfo->head->result == 0 && req->r_locked_dir)
1082                         ceph_invalidate_dir_request(req);
1083                 return 0;
1084         }
1085
1086         if (rinfo->head->is_dentry) {
1087                 struct inode *dir = req->r_locked_dir;
1088
1089                 if (dir) {
1090                         err = fill_inode(dir, NULL,
1091                                          &rinfo->diri, rinfo->dirfrag,
1092                                          session, req->r_request_started, -1,
1093                                          &req->r_caps_reservation);
1094                         if (err < 0)
1095                                 goto done;
1096                 } else {
1097                         WARN_ON_ONCE(1);
1098                 }
1099
1100                 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1101                         struct qstr dname;
1102                         struct dentry *dn, *parent;
1103
1104                         BUG_ON(!rinfo->head->is_target);
1105                         BUG_ON(req->r_dentry);
1106
1107                         parent = d_find_any_alias(dir);
1108                         BUG_ON(!parent);
1109
1110                         dname.name = rinfo->dname;
1111                         dname.len = rinfo->dname_len;
1112                         dname.hash = full_name_hash(dname.name, dname.len);
1113                         vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1114                         vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1115 retry_lookup:
1116                         dn = d_lookup(parent, &dname);
1117                         dout("d_lookup on parent=%p name=%.*s got %p\n",
1118                              parent, dname.len, dname.name, dn);
1119
1120                         if (!dn) {
1121                                 dn = d_alloc(parent, &dname);
1122                                 dout("d_alloc %p '%.*s' = %p\n", parent,
1123                                      dname.len, dname.name, dn);
1124                                 if (dn == NULL) {
1125                                         dput(parent);
1126                                         err = -ENOMEM;
1127                                         goto done;
1128                                 }
1129                                 err = ceph_init_dentry(dn);
1130                                 if (err < 0) {
1131                                         dput(dn);
1132                                         dput(parent);
1133                                         goto done;
1134                                 }
1135                         } else if (d_really_is_positive(dn) &&
1136                                    (ceph_ino(d_inode(dn)) != vino.ino ||
1137                                     ceph_snap(d_inode(dn)) != vino.snap)) {
1138                                 dout(" dn %p points to wrong inode %p\n",
1139                                      dn, d_inode(dn));
1140                                 d_delete(dn);
1141                                 dput(dn);
1142                                 goto retry_lookup;
1143                         }
1144
1145                         req->r_dentry = dn;
1146                         dput(parent);
1147                 }
1148         }
1149
1150         if (rinfo->head->is_target) {
1151                 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1152                 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1153
1154                 in = ceph_get_inode(sb, vino);
1155                 if (IS_ERR(in)) {
1156                         err = PTR_ERR(in);
1157                         goto done;
1158                 }
1159                 req->r_target_inode = in;
1160
1161                 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1162                                 session, req->r_request_started,
1163                                 (!req->r_aborted && rinfo->head->result == 0) ?
1164                                 req->r_fmode : -1,
1165                                 &req->r_caps_reservation);
1166                 if (err < 0) {
1167                         pr_err("fill_inode badness %p %llx.%llx\n",
1168                                 in, ceph_vinop(in));
1169                         goto done;
1170                 }
1171         }
1172
1173         /*
1174          * ignore null lease/binding on snapdir ENOENT, or else we
1175          * will have trouble splicing in the virtual snapdir later
1176          */
1177         if (rinfo->head->is_dentry && !req->r_aborted &&
1178             req->r_locked_dir &&
1179             (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1180                                                fsc->mount_options->snapdir_name,
1181                                                req->r_dentry->d_name.len))) {
1182                 /*
1183                  * lookup link rename   : null -> possibly existing inode
1184                  * mknod symlink mkdir  : null -> new inode
1185                  * unlink               : linked -> null
1186                  */
1187                 struct inode *dir = req->r_locked_dir;
1188                 struct dentry *dn = req->r_dentry;
1189                 bool have_dir_cap, have_lease;
1190
1191                 BUG_ON(!dn);
1192                 BUG_ON(!dir);
1193                 BUG_ON(d_inode(dn->d_parent) != dir);
1194                 BUG_ON(ceph_ino(dir) !=
1195                        le64_to_cpu(rinfo->diri.in->ino));
1196                 BUG_ON(ceph_snap(dir) !=
1197                        le64_to_cpu(rinfo->diri.in->snapid));
1198
1199                 /* do we have a lease on the whole dir? */
1200                 have_dir_cap =
1201                         (le32_to_cpu(rinfo->diri.in->cap.caps) &
1202                          CEPH_CAP_FILE_SHARED);
1203
1204                 /* do we have a dn lease? */
1205                 have_lease = have_dir_cap ||
1206                         le32_to_cpu(rinfo->dlease->duration_ms);
1207                 if (!have_lease)
1208                         dout("fill_trace  no dentry lease or dir cap\n");
1209
1210                 /* rename? */
1211                 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1212                         struct inode *olddir = req->r_old_dentry_dir;
1213                         BUG_ON(!olddir);
1214
1215                         dout(" src %p '%pd' dst %p '%pd'\n",
1216                              req->r_old_dentry,
1217                              req->r_old_dentry,
1218                              dn, dn);
1219                         dout("fill_trace doing d_move %p -> %p\n",
1220                              req->r_old_dentry, dn);
1221
1222                         /* d_move screws up sibling dentries' offsets */
1223                         ceph_dir_clear_ordered(dir);
1224                         ceph_dir_clear_ordered(olddir);
1225
1226                         d_move(req->r_old_dentry, dn);
1227                         dout(" src %p '%pd' dst %p '%pd'\n",
1228                              req->r_old_dentry,
1229                              req->r_old_dentry,
1230                              dn, dn);
1231
1232                         /* ensure target dentry is invalidated, despite
1233                            rehashing bug in vfs_rename_dir */
1234                         ceph_invalidate_dentry_lease(dn);
1235
1236                         dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1237                              ceph_dentry(req->r_old_dentry)->offset);
1238
1239                         dn = req->r_old_dentry;  /* use old_dentry */
1240                 }
1241
1242                 /* null dentry? */
1243                 if (!rinfo->head->is_target) {
1244                         dout("fill_trace null dentry\n");
1245                         if (d_really_is_positive(dn)) {
1246                                 ceph_dir_clear_ordered(dir);
1247                                 dout("d_delete %p\n", dn);
1248                                 d_delete(dn);
1249                         } else {
1250                                 dout("d_instantiate %p NULL\n", dn);
1251                                 d_instantiate(dn, NULL);
1252                                 if (have_lease && d_unhashed(dn))
1253                                         d_rehash(dn);
1254                                 update_dentry_lease(dn, rinfo->dlease,
1255                                                     session,
1256                                                     req->r_request_started);
1257                         }
1258                         goto done;
1259                 }
1260
1261                 /* attach proper inode */
1262                 if (d_really_is_negative(dn)) {
1263                         ceph_dir_clear_ordered(dir);
1264                         ihold(in);
1265                         dn = splice_dentry(dn, in, &have_lease);
1266                         if (IS_ERR(dn)) {
1267                                 err = PTR_ERR(dn);
1268                                 goto done;
1269                         }
1270                         req->r_dentry = dn;  /* may have spliced */
1271                 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1272                         dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1273                              dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1274                              ceph_vinop(in));
1275                         have_lease = false;
1276                 }
1277
1278                 if (have_lease)
1279                         update_dentry_lease(dn, rinfo->dlease, session,
1280                                             req->r_request_started);
1281                 dout(" final dn %p\n", dn);
1282         } else if (!req->r_aborted &&
1283                    (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1284                     req->r_op == CEPH_MDS_OP_MKSNAP)) {
1285                 struct dentry *dn = req->r_dentry;
1286                 struct inode *dir = req->r_locked_dir;
1287
1288                 /* fill out a snapdir LOOKUPSNAP dentry */
1289                 BUG_ON(!dn);
1290                 BUG_ON(!dir);
1291                 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1292                 dout(" linking snapped dir %p to dn %p\n", in, dn);
1293                 ceph_dir_clear_ordered(dir);
1294                 ihold(in);
1295                 dn = splice_dentry(dn, in, NULL);
1296                 if (IS_ERR(dn)) {
1297                         err = PTR_ERR(dn);
1298                         goto done;
1299                 }
1300                 req->r_dentry = dn;  /* may have spliced */
1301         }
1302 done:
1303         dout("fill_trace done err=%d\n", err);
1304         return err;
1305 }
1306
1307 /*
1308  * Prepopulate our cache with readdir results, leases, etc.
1309  */
1310 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1311                                            struct ceph_mds_session *session)
1312 {
1313         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1314         int i, err = 0;
1315
1316         for (i = 0; i < rinfo->dir_nr; i++) {
1317                 struct ceph_vino vino;
1318                 struct inode *in;
1319                 int rc;
1320
1321                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1322                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1323
1324                 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1325                 if (IS_ERR(in)) {
1326                         err = PTR_ERR(in);
1327                         dout("new_inode badness got %d\n", err);
1328                         continue;
1329                 }
1330                 rc = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1331                                 req->r_request_started, -1,
1332                                 &req->r_caps_reservation);
1333                 if (rc < 0) {
1334                         pr_err("fill_inode badness on %p got %d\n", in, rc);
1335                         err = rc;
1336                         continue;
1337                 }
1338         }
1339
1340         return err;
1341 }
1342
1343 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1344 {
1345         if (ctl->page) {
1346                 kunmap(ctl->page);
1347                 page_cache_release(ctl->page);
1348                 ctl->page = NULL;
1349         }
1350 }
1351
1352 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1353                               struct ceph_readdir_cache_control *ctl,
1354                               struct ceph_mds_request *req)
1355 {
1356         struct ceph_inode_info *ci = ceph_inode(dir);
1357         unsigned nsize = PAGE_CACHE_SIZE / sizeof(struct dentry*);
1358         unsigned idx = ctl->index % nsize;
1359         pgoff_t pgoff = ctl->index / nsize;
1360
1361         if (!ctl->page || pgoff != page_index(ctl->page)) {
1362                 ceph_readdir_cache_release(ctl);
1363                 ctl->page  = grab_cache_page(&dir->i_data, pgoff);
1364                 if (!ctl->page) {
1365                         ctl->index = -1;
1366                         return -ENOMEM;
1367                 }
1368                 /* reading/filling the cache are serialized by
1369                  * i_mutex, no need to use page lock */
1370                 unlock_page(ctl->page);
1371                 ctl->dentries = kmap(ctl->page);
1372         }
1373
1374         if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1375             req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1376                 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1377                 ctl->dentries[idx] = dn;
1378                 ctl->index++;
1379         } else {
1380                 dout("disable readdir cache\n");
1381                 ctl->index = -1;
1382         }
1383         return 0;
1384 }
1385
1386 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1387                              struct ceph_mds_session *session)
1388 {
1389         struct dentry *parent = req->r_dentry;
1390         struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1391         struct qstr dname;
1392         struct dentry *dn;
1393         struct inode *in;
1394         int err = 0, ret, i;
1395         struct inode *snapdir = NULL;
1396         struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1397         struct ceph_dentry_info *di;
1398         u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1399         struct ceph_readdir_cache_control cache_ctl = {};
1400
1401         if (req->r_aborted)
1402                 return readdir_prepopulate_inodes_only(req, session);
1403
1404         if (rinfo->dir_dir &&
1405             le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1406                 dout("readdir_prepopulate got new frag %x -> %x\n",
1407                      frag, le32_to_cpu(rinfo->dir_dir->frag));
1408                 frag = le32_to_cpu(rinfo->dir_dir->frag);
1409                 if (ceph_frag_is_leftmost(frag))
1410                         req->r_readdir_offset = 2;
1411                 else
1412                         req->r_readdir_offset = 0;
1413         }
1414
1415         if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1416                 snapdir = ceph_get_snapdir(d_inode(parent));
1417                 parent = d_find_alias(snapdir);
1418                 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1419                      rinfo->dir_nr, parent);
1420         } else {
1421                 dout("readdir_prepopulate %d items under dn %p\n",
1422                      rinfo->dir_nr, parent);
1423                 if (rinfo->dir_dir)
1424                         ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1425         }
1426
1427         if (ceph_frag_is_leftmost(frag) && req->r_readdir_offset == 2) {
1428                 /* note dir version at start of readdir so we can tell
1429                  * if any dentries get dropped */
1430                 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1431                 req->r_dir_release_cnt = atomic64_read(&ci->i_release_count);
1432                 req->r_dir_ordered_cnt = atomic64_read(&ci->i_ordered_count);
1433                 req->r_readdir_cache_idx = 0;
1434         }
1435
1436         cache_ctl.index = req->r_readdir_cache_idx;
1437
1438         /* FIXME: release caps/leases if error occurs */
1439         for (i = 0; i < rinfo->dir_nr; i++) {
1440                 struct ceph_vino vino;
1441
1442                 dname.name = rinfo->dir_dname[i];
1443                 dname.len = rinfo->dir_dname_len[i];
1444                 dname.hash = full_name_hash(dname.name, dname.len);
1445
1446                 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1447                 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1448
1449 retry_lookup:
1450                 dn = d_lookup(parent, &dname);
1451                 dout("d_lookup on parent=%p name=%.*s got %p\n",
1452                      parent, dname.len, dname.name, dn);
1453
1454                 if (!dn) {
1455                         dn = d_alloc(parent, &dname);
1456                         dout("d_alloc %p '%.*s' = %p\n", parent,
1457                              dname.len, dname.name, dn);
1458                         if (dn == NULL) {
1459                                 dout("d_alloc badness\n");
1460                                 err = -ENOMEM;
1461                                 goto out;
1462                         }
1463                         ret = ceph_init_dentry(dn);
1464                         if (ret < 0) {
1465                                 dput(dn);
1466                                 err = ret;
1467                                 goto out;
1468                         }
1469                 } else if (d_really_is_positive(dn) &&
1470                            (ceph_ino(d_inode(dn)) != vino.ino ||
1471                             ceph_snap(d_inode(dn)) != vino.snap)) {
1472                         dout(" dn %p points to wrong inode %p\n",
1473                              dn, d_inode(dn));
1474                         d_delete(dn);
1475                         dput(dn);
1476                         goto retry_lookup;
1477                 }
1478
1479                 /* inode */
1480                 if (d_really_is_positive(dn)) {
1481                         in = d_inode(dn);
1482                 } else {
1483                         in = ceph_get_inode(parent->d_sb, vino);
1484                         if (IS_ERR(in)) {
1485                                 dout("new_inode badness\n");
1486                                 d_drop(dn);
1487                                 dput(dn);
1488                                 err = PTR_ERR(in);
1489                                 goto out;
1490                         }
1491                 }
1492
1493                 ret = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1494                                  req->r_request_started, -1,
1495                                  &req->r_caps_reservation);
1496                 if (ret < 0) {
1497                         pr_err("fill_inode badness on %p\n", in);
1498                         if (d_really_is_negative(dn))
1499                                 iput(in);
1500                         d_drop(dn);
1501                         err = ret;
1502                         goto next_item;
1503                 }
1504
1505                 if (d_really_is_negative(dn)) {
1506                         struct dentry *realdn = splice_dentry(dn, in, NULL);
1507                         if (IS_ERR(realdn)) {
1508                                 err = PTR_ERR(realdn);
1509                                 d_drop(dn);
1510                                 dn = NULL;
1511                                 goto next_item;
1512                         }
1513                         dn = realdn;
1514                 }
1515
1516                 di = dn->d_fsdata;
1517                 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1518
1519                 update_dentry_lease(dn, rinfo->dir_dlease[i],
1520                                     req->r_session,
1521                                     req->r_request_started);
1522
1523                 if (err == 0 && cache_ctl.index >= 0) {
1524                         ret = fill_readdir_cache(d_inode(parent), dn,
1525                                                  &cache_ctl, req);
1526                         if (ret < 0)
1527                                 err = ret;
1528                 }
1529 next_item:
1530                 if (dn)
1531                         dput(dn);
1532         }
1533 out:
1534         if (err == 0) {
1535                 req->r_did_prepopulate = true;
1536                 req->r_readdir_cache_idx = cache_ctl.index;
1537         }
1538         ceph_readdir_cache_release(&cache_ctl);
1539         if (snapdir) {
1540                 iput(snapdir);
1541                 dput(parent);
1542         }
1543         dout("readdir_prepopulate done\n");
1544         return err;
1545 }
1546
1547 int ceph_inode_set_size(struct inode *inode, loff_t size)
1548 {
1549         struct ceph_inode_info *ci = ceph_inode(inode);
1550         int ret = 0;
1551
1552         spin_lock(&ci->i_ceph_lock);
1553         dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1554         i_size_write(inode, size);
1555         inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1556
1557         /* tell the MDS if we are approaching max_size */
1558         if ((size << 1) >= ci->i_max_size &&
1559             (ci->i_reported_size << 1) < ci->i_max_size)
1560                 ret = 1;
1561
1562         spin_unlock(&ci->i_ceph_lock);
1563         return ret;
1564 }
1565
1566 /*
1567  * Write back inode data in a worker thread.  (This can't be done
1568  * in the message handler context.)
1569  */
1570 void ceph_queue_writeback(struct inode *inode)
1571 {
1572         ihold(inode);
1573         if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1574                        &ceph_inode(inode)->i_wb_work)) {
1575                 dout("ceph_queue_writeback %p\n", inode);
1576         } else {
1577                 dout("ceph_queue_writeback %p failed\n", inode);
1578                 iput(inode);
1579         }
1580 }
1581
1582 static void ceph_writeback_work(struct work_struct *work)
1583 {
1584         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1585                                                   i_wb_work);
1586         struct inode *inode = &ci->vfs_inode;
1587
1588         dout("writeback %p\n", inode);
1589         filemap_fdatawrite(&inode->i_data);
1590         iput(inode);
1591 }
1592
1593 /*
1594  * queue an async invalidation
1595  */
1596 void ceph_queue_invalidate(struct inode *inode)
1597 {
1598         ihold(inode);
1599         if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1600                        &ceph_inode(inode)->i_pg_inv_work)) {
1601                 dout("ceph_queue_invalidate %p\n", inode);
1602         } else {
1603                 dout("ceph_queue_invalidate %p failed\n", inode);
1604                 iput(inode);
1605         }
1606 }
1607
1608 /*
1609  * Invalidate inode pages in a worker thread.  (This can't be done
1610  * in the message handler context.)
1611  */
1612 static void ceph_invalidate_work(struct work_struct *work)
1613 {
1614         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1615                                                   i_pg_inv_work);
1616         struct inode *inode = &ci->vfs_inode;
1617         u32 orig_gen;
1618         int check = 0;
1619
1620         mutex_lock(&ci->i_truncate_mutex);
1621         spin_lock(&ci->i_ceph_lock);
1622         dout("invalidate_pages %p gen %d revoking %d\n", inode,
1623              ci->i_rdcache_gen, ci->i_rdcache_revoking);
1624         if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1625                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1626                         check = 1;
1627                 spin_unlock(&ci->i_ceph_lock);
1628                 mutex_unlock(&ci->i_truncate_mutex);
1629                 goto out;
1630         }
1631         orig_gen = ci->i_rdcache_gen;
1632         spin_unlock(&ci->i_ceph_lock);
1633
1634         truncate_pagecache(inode, 0);
1635
1636         spin_lock(&ci->i_ceph_lock);
1637         if (orig_gen == ci->i_rdcache_gen &&
1638             orig_gen == ci->i_rdcache_revoking) {
1639                 dout("invalidate_pages %p gen %d successful\n", inode,
1640                      ci->i_rdcache_gen);
1641                 ci->i_rdcache_revoking--;
1642                 check = 1;
1643         } else {
1644                 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1645                      inode, orig_gen, ci->i_rdcache_gen,
1646                      ci->i_rdcache_revoking);
1647                 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1648                         check = 1;
1649         }
1650         spin_unlock(&ci->i_ceph_lock);
1651         mutex_unlock(&ci->i_truncate_mutex);
1652 out:
1653         if (check)
1654                 ceph_check_caps(ci, 0, NULL);
1655         iput(inode);
1656 }
1657
1658
1659 /*
1660  * called by trunc_wq;
1661  *
1662  * We also truncate in a separate thread as well.
1663  */
1664 static void ceph_vmtruncate_work(struct work_struct *work)
1665 {
1666         struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1667                                                   i_vmtruncate_work);
1668         struct inode *inode = &ci->vfs_inode;
1669
1670         dout("vmtruncate_work %p\n", inode);
1671         __ceph_do_pending_vmtruncate(inode);
1672         iput(inode);
1673 }
1674
1675 /*
1676  * Queue an async vmtruncate.  If we fail to queue work, we will handle
1677  * the truncation the next time we call __ceph_do_pending_vmtruncate.
1678  */
1679 void ceph_queue_vmtruncate(struct inode *inode)
1680 {
1681         struct ceph_inode_info *ci = ceph_inode(inode);
1682
1683         ihold(inode);
1684
1685         if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1686                        &ci->i_vmtruncate_work)) {
1687                 dout("ceph_queue_vmtruncate %p\n", inode);
1688         } else {
1689                 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1690                      inode, ci->i_truncate_pending);
1691                 iput(inode);
1692         }
1693 }
1694
1695 /*
1696  * Make sure any pending truncation is applied before doing anything
1697  * that may depend on it.
1698  */
1699 void __ceph_do_pending_vmtruncate(struct inode *inode)
1700 {
1701         struct ceph_inode_info *ci = ceph_inode(inode);
1702         u64 to;
1703         int wrbuffer_refs, finish = 0;
1704
1705         mutex_lock(&ci->i_truncate_mutex);
1706 retry:
1707         spin_lock(&ci->i_ceph_lock);
1708         if (ci->i_truncate_pending == 0) {
1709                 dout("__do_pending_vmtruncate %p none pending\n", inode);
1710                 spin_unlock(&ci->i_ceph_lock);
1711                 mutex_unlock(&ci->i_truncate_mutex);
1712                 return;
1713         }
1714
1715         /*
1716          * make sure any dirty snapped pages are flushed before we
1717          * possibly truncate them.. so write AND block!
1718          */
1719         if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1720                 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1721                      inode);
1722                 spin_unlock(&ci->i_ceph_lock);
1723                 filemap_write_and_wait_range(&inode->i_data, 0,
1724                                              inode->i_sb->s_maxbytes);
1725                 goto retry;
1726         }
1727
1728         /* there should be no reader or writer */
1729         WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1730
1731         to = ci->i_truncate_size;
1732         wrbuffer_refs = ci->i_wrbuffer_ref;
1733         dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1734              ci->i_truncate_pending, to);
1735         spin_unlock(&ci->i_ceph_lock);
1736
1737         truncate_pagecache(inode, to);
1738
1739         spin_lock(&ci->i_ceph_lock);
1740         if (to == ci->i_truncate_size) {
1741                 ci->i_truncate_pending = 0;
1742                 finish = 1;
1743         }
1744         spin_unlock(&ci->i_ceph_lock);
1745         if (!finish)
1746                 goto retry;
1747
1748         mutex_unlock(&ci->i_truncate_mutex);
1749
1750         if (wrbuffer_refs == 0)
1751                 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1752
1753         wake_up_all(&ci->i_cap_wq);
1754 }
1755
1756 /*
1757  * symlinks
1758  */
1759 static const struct inode_operations ceph_symlink_iops = {
1760         .readlink = generic_readlink,
1761         .get_link = simple_get_link,
1762         .setattr = ceph_setattr,
1763         .getattr = ceph_getattr,
1764         .setxattr = ceph_setxattr,
1765         .getxattr = ceph_getxattr,
1766         .listxattr = ceph_listxattr,
1767         .removexattr = ceph_removexattr,
1768 };
1769
1770 /*
1771  * setattr
1772  */
1773 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1774 {
1775         struct inode *inode = d_inode(dentry);
1776         struct ceph_inode_info *ci = ceph_inode(inode);
1777         const unsigned int ia_valid = attr->ia_valid;
1778         struct ceph_mds_request *req;
1779         struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1780         struct ceph_cap_flush *prealloc_cf;
1781         int issued;
1782         int release = 0, dirtied = 0;
1783         int mask = 0;
1784         int err = 0;
1785         int inode_dirty_flags = 0;
1786         bool lock_snap_rwsem = false;
1787
1788         if (ceph_snap(inode) != CEPH_NOSNAP)
1789                 return -EROFS;
1790
1791         err = inode_change_ok(inode, attr);
1792         if (err != 0)
1793                 return err;
1794
1795         prealloc_cf = ceph_alloc_cap_flush();
1796         if (!prealloc_cf)
1797                 return -ENOMEM;
1798
1799         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1800                                        USE_AUTH_MDS);
1801         if (IS_ERR(req)) {
1802                 ceph_free_cap_flush(prealloc_cf);
1803                 return PTR_ERR(req);
1804         }
1805
1806         spin_lock(&ci->i_ceph_lock);
1807         issued = __ceph_caps_issued(ci, NULL);
1808
1809         if (!ci->i_head_snapc &&
1810             (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1811                 lock_snap_rwsem = true;
1812                 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1813                         spin_unlock(&ci->i_ceph_lock);
1814                         down_read(&mdsc->snap_rwsem);
1815                         spin_lock(&ci->i_ceph_lock);
1816                         issued = __ceph_caps_issued(ci, NULL);
1817                 }
1818         }
1819
1820         dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1821
1822         if (ia_valid & ATTR_UID) {
1823                 dout("setattr %p uid %d -> %d\n", inode,
1824                      from_kuid(&init_user_ns, inode->i_uid),
1825                      from_kuid(&init_user_ns, attr->ia_uid));
1826                 if (issued & CEPH_CAP_AUTH_EXCL) {
1827                         inode->i_uid = attr->ia_uid;
1828                         dirtied |= CEPH_CAP_AUTH_EXCL;
1829                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1830                            !uid_eq(attr->ia_uid, inode->i_uid)) {
1831                         req->r_args.setattr.uid = cpu_to_le32(
1832                                 from_kuid(&init_user_ns, attr->ia_uid));
1833                         mask |= CEPH_SETATTR_UID;
1834                         release |= CEPH_CAP_AUTH_SHARED;
1835                 }
1836         }
1837         if (ia_valid & ATTR_GID) {
1838                 dout("setattr %p gid %d -> %d\n", inode,
1839                      from_kgid(&init_user_ns, inode->i_gid),
1840                      from_kgid(&init_user_ns, attr->ia_gid));
1841                 if (issued & CEPH_CAP_AUTH_EXCL) {
1842                         inode->i_gid = attr->ia_gid;
1843                         dirtied |= CEPH_CAP_AUTH_EXCL;
1844                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1845                            !gid_eq(attr->ia_gid, inode->i_gid)) {
1846                         req->r_args.setattr.gid = cpu_to_le32(
1847                                 from_kgid(&init_user_ns, attr->ia_gid));
1848                         mask |= CEPH_SETATTR_GID;
1849                         release |= CEPH_CAP_AUTH_SHARED;
1850                 }
1851         }
1852         if (ia_valid & ATTR_MODE) {
1853                 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1854                      attr->ia_mode);
1855                 if (issued & CEPH_CAP_AUTH_EXCL) {
1856                         inode->i_mode = attr->ia_mode;
1857                         dirtied |= CEPH_CAP_AUTH_EXCL;
1858                 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1859                            attr->ia_mode != inode->i_mode) {
1860                         inode->i_mode = attr->ia_mode;
1861                         req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1862                         mask |= CEPH_SETATTR_MODE;
1863                         release |= CEPH_CAP_AUTH_SHARED;
1864                 }
1865         }
1866
1867         if (ia_valid & ATTR_ATIME) {
1868                 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1869                      inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1870                      attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1871                 if (issued & CEPH_CAP_FILE_EXCL) {
1872                         ci->i_time_warp_seq++;
1873                         inode->i_atime = attr->ia_atime;
1874                         dirtied |= CEPH_CAP_FILE_EXCL;
1875                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1876                            timespec_compare(&inode->i_atime,
1877                                             &attr->ia_atime) < 0) {
1878                         inode->i_atime = attr->ia_atime;
1879                         dirtied |= CEPH_CAP_FILE_WR;
1880                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1881                            !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1882                         ceph_encode_timespec(&req->r_args.setattr.atime,
1883                                              &attr->ia_atime);
1884                         mask |= CEPH_SETATTR_ATIME;
1885                         release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1886                                 CEPH_CAP_FILE_WR;
1887                 }
1888         }
1889         if (ia_valid & ATTR_MTIME) {
1890                 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1891                      inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1892                      attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1893                 if (issued & CEPH_CAP_FILE_EXCL) {
1894                         ci->i_time_warp_seq++;
1895                         inode->i_mtime = attr->ia_mtime;
1896                         dirtied |= CEPH_CAP_FILE_EXCL;
1897                 } else if ((issued & CEPH_CAP_FILE_WR) &&
1898                            timespec_compare(&inode->i_mtime,
1899                                             &attr->ia_mtime) < 0) {
1900                         inode->i_mtime = attr->ia_mtime;
1901                         dirtied |= CEPH_CAP_FILE_WR;
1902                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1903                            !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1904                         ceph_encode_timespec(&req->r_args.setattr.mtime,
1905                                              &attr->ia_mtime);
1906                         mask |= CEPH_SETATTR_MTIME;
1907                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1908                                 CEPH_CAP_FILE_WR;
1909                 }
1910         }
1911         if (ia_valid & ATTR_SIZE) {
1912                 dout("setattr %p size %lld -> %lld\n", inode,
1913                      inode->i_size, attr->ia_size);
1914                 if ((issued & CEPH_CAP_FILE_EXCL) &&
1915                     attr->ia_size > inode->i_size) {
1916                         i_size_write(inode, attr->ia_size);
1917                         inode->i_blocks =
1918                                 (attr->ia_size + (1 << 9) - 1) >> 9;
1919                         inode->i_ctime = attr->ia_ctime;
1920                         ci->i_reported_size = attr->ia_size;
1921                         dirtied |= CEPH_CAP_FILE_EXCL;
1922                 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1923                            attr->ia_size != inode->i_size) {
1924                         req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1925                         req->r_args.setattr.old_size =
1926                                 cpu_to_le64(inode->i_size);
1927                         mask |= CEPH_SETATTR_SIZE;
1928                         release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1929                                 CEPH_CAP_FILE_WR;
1930                 }
1931         }
1932
1933         /* these do nothing */
1934         if (ia_valid & ATTR_CTIME) {
1935                 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1936                                          ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1937                 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1938                      inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1939                      attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1940                      only ? "ctime only" : "ignored");
1941                 inode->i_ctime = attr->ia_ctime;
1942                 if (only) {
1943                         /*
1944                          * if kernel wants to dirty ctime but nothing else,
1945                          * we need to choose a cap to dirty under, or do
1946                          * a almost-no-op setattr
1947                          */
1948                         if (issued & CEPH_CAP_AUTH_EXCL)
1949                                 dirtied |= CEPH_CAP_AUTH_EXCL;
1950                         else if (issued & CEPH_CAP_FILE_EXCL)
1951                                 dirtied |= CEPH_CAP_FILE_EXCL;
1952                         else if (issued & CEPH_CAP_XATTR_EXCL)
1953                                 dirtied |= CEPH_CAP_XATTR_EXCL;
1954                         else
1955                                 mask |= CEPH_SETATTR_CTIME;
1956                 }
1957         }
1958         if (ia_valid & ATTR_FILE)
1959                 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1960
1961         if (dirtied) {
1962                 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
1963                                                            &prealloc_cf);
1964                 inode->i_ctime = CURRENT_TIME;
1965         }
1966
1967         release &= issued;
1968         spin_unlock(&ci->i_ceph_lock);
1969         if (lock_snap_rwsem)
1970                 up_read(&mdsc->snap_rwsem);
1971
1972         if (inode_dirty_flags)
1973                 __mark_inode_dirty(inode, inode_dirty_flags);
1974
1975         if (ia_valid & ATTR_MODE) {
1976                 err = posix_acl_chmod(inode, attr->ia_mode);
1977                 if (err)
1978                         goto out_put;
1979         }
1980
1981         if (mask) {
1982                 req->r_inode = inode;
1983                 ihold(inode);
1984                 req->r_inode_drop = release;
1985                 req->r_args.setattr.mask = cpu_to_le32(mask);
1986                 req->r_num_caps = 1;
1987                 err = ceph_mdsc_do_request(mdsc, NULL, req);
1988         }
1989         dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1990              ceph_cap_string(dirtied), mask);
1991
1992         ceph_mdsc_put_request(req);
1993         if (mask & CEPH_SETATTR_SIZE)
1994                 __ceph_do_pending_vmtruncate(inode);
1995         ceph_free_cap_flush(prealloc_cf);
1996         return err;
1997 out_put:
1998         ceph_mdsc_put_request(req);
1999         ceph_free_cap_flush(prealloc_cf);
2000         return err;
2001 }
2002
2003 /*
2004  * Verify that we have a lease on the given mask.  If not,
2005  * do a getattr against an mds.
2006  */
2007 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2008                       int mask, bool force)
2009 {
2010         struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2011         struct ceph_mds_client *mdsc = fsc->mdsc;
2012         struct ceph_mds_request *req;
2013         int err;
2014
2015         if (ceph_snap(inode) == CEPH_SNAPDIR) {
2016                 dout("do_getattr inode %p SNAPDIR\n", inode);
2017                 return 0;
2018         }
2019
2020         dout("do_getattr inode %p mask %s mode 0%o\n",
2021              inode, ceph_cap_string(mask), inode->i_mode);
2022         if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2023                 return 0;
2024
2025         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2026         if (IS_ERR(req))
2027                 return PTR_ERR(req);
2028         req->r_inode = inode;
2029         ihold(inode);
2030         req->r_num_caps = 1;
2031         req->r_args.getattr.mask = cpu_to_le32(mask);
2032         req->r_locked_page = locked_page;
2033         err = ceph_mdsc_do_request(mdsc, NULL, req);
2034         if (locked_page && err == 0) {
2035                 u64 inline_version = req->r_reply_info.targeti.inline_version;
2036                 if (inline_version == 0) {
2037                         /* the reply is supposed to contain inline data */
2038                         err = -EINVAL;
2039                 } else if (inline_version == CEPH_INLINE_NONE) {
2040                         err = -ENODATA;
2041                 } else {
2042                         err = req->r_reply_info.targeti.inline_len;
2043                 }
2044         }
2045         ceph_mdsc_put_request(req);
2046         dout("do_getattr result=%d\n", err);
2047         return err;
2048 }
2049
2050
2051 /*
2052  * Check inode permissions.  We verify we have a valid value for
2053  * the AUTH cap, then call the generic handler.
2054  */
2055 int ceph_permission(struct inode *inode, int mask)
2056 {
2057         int err;
2058
2059         if (mask & MAY_NOT_BLOCK)
2060                 return -ECHILD;
2061
2062         err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2063
2064         if (!err)
2065                 err = generic_permission(inode, mask);
2066         return err;
2067 }
2068
2069 /*
2070  * Get all attributes.  Hopefully somedata we'll have a statlite()
2071  * and can limit the fields we require to be accurate.
2072  */
2073 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
2074                  struct kstat *stat)
2075 {
2076         struct inode *inode = d_inode(dentry);
2077         struct ceph_inode_info *ci = ceph_inode(inode);
2078         int err;
2079
2080         err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2081         if (!err) {
2082                 generic_fillattr(inode, stat);
2083                 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2084                 if (ceph_snap(inode) != CEPH_NOSNAP)
2085                         stat->dev = ceph_snap(inode);
2086                 else
2087                         stat->dev = 0;
2088                 if (S_ISDIR(inode->i_mode)) {
2089                         if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2090                                                 RBYTES))
2091                                 stat->size = ci->i_rbytes;
2092                         else
2093                                 stat->size = ci->i_files + ci->i_subdirs;
2094                         stat->blocks = 0;
2095                         stat->blksize = 65536;
2096                 }
2097         }
2098         return err;
2099 }